CONTROL DEVICE AND WORK VEHICLE

To visually recognize various regions inside a field and outside the field more easily by an operator. A control portion (80) includes a vehicle-position acquiring portion (85), a field-contour setting portion (83), a region setting portion (84), and a display processing portion (86). The vehicle-position acquiring portion (85) acquires position information (99) indicating a position of the combine harvester (1) traveling on a field (98). The field-contour setting portion (83) sets a contour (981P) of a field (98) on the basis of a plurality of pieces of the position information (99). The region setting portion (84) sets a region not subject to a work indicating a region which is not a target for the work by the combine harvester (1) inside the field (98) or outside the field (98) on the basis of the contour (981P). The display processing portion (86) causes a field image (98P) showing the field (98) and an identification image (94) for identifying the region not subject to the work, to be displayed on a display portion (73).